Relay circuit



June 16, 1931.

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R. c. MA1-HES RELAY CIRCUIT Filed June 6, 1929 HG. Z

Z-'Shutl-Shoet 2 1 lllll l l l l l l l l l l uuvvv AAAAA /NVENraR FE CIMAT/45s TRNEY Patented June 16, 1931 ROBERT- C. MATHES, OF WYOMING,LABORATORIES, INCORPORATED, YORK RELAY CIRCUIT Application led June 6,1929.A Serial No. 368,895.

This invention relates to accelerating and delay action devices and moreparticularly to relay arrangementsv suitable for controlling signaloperated devices in signaling systems such for example, as voiceoperated control circuits. y

The main object of the invention is to provide a circuit arrangementwhich will operate quickly and hold for a suicient time after itoperates to insure proper operation of the circuit with which it is tobe employed.

One of the features of this invention consists in the method employed tosecure `rapid operation without contact chatter when the relay isemployed in connection with signal operated volume control circuits.

A relay having a plurality of windings is employed in conjunction with asingle source of potential and resistances `and condensers. Twocondensers are employed, each of which is in series with a winding ofthe relay. When an impulse, as for example, from the output of a voiceoperated detector circuit, is-transmitted through the operating winding,the armature is movedvfrom its normal position and the normally closedcontact'opens. This causes one of the condensers to discharge throughone ofthe accelerating windings referred to and assists in completelyoperating the relay. When the armature makes contact with the normallyopen Contact, a second condenser charges through the other aeceleratingwinding on the relay which holds the armature rigidly against thiscontact,

thereby preventing contact chattering. When this holding currentapproaches zero amplitude and the current through the operating windingapproaches Vzero amplitude, mechanical or electricalbias maybe used tobreak the armature from the normally open contact. The second condenserdischarges through the accelerating winding associated therewith andassists vthe armature to return to its normal position. When thearmature makes with the normallyclosed contact, the condenser firstreferred to charges through the accelerating winding associatedtherewith and produces a holding force similar to that obtained when thearmature makes contact with the normally open contact. When.

.ments shown in Figs. 1

no mechanical or electrical bias is used to make one contact thenormally closed contact, the arrangement functions to accelerate andmake more positive the normal functions of a polar relay.

The invention will be better understood by referring to the followingdetailed description and accompanying drawings, wherein Figs. verseembodiments of the invention, and Figs. l--A and 2-A illustrate the sameembodiand 2 respectively, showing the relays in schematic form tofacilitate understanding the description of the invention.

Referring to F igs.` 1 and 1-A, the polar relay 1 comprises a yoke 2, apermanent magnet 4 associated with the yoke, windingsI 3, 5 and 6 and anarmature 7, which armatureis arranged to swing between contacts 9 and10. The armature 7 is held in the position shown, away fromV -the yokeleg 19, by biasing means 8.

Coil 3 is connected tothe input circuit 11. One end of winding isconnected to contact 9. The other end of Winding 5 is connected to oneend of condenser 12, the other end of which `condenser is connectedthrough a resistance 13 to a source of potential 14. One

end of winding 6 is connected to contact 10. The other end of winding 6is connected to one end of a. condenser 15, the other end of whichcondenser is connectedthrough a resistance 16 to the side of the sourceof potential 14 to which resistance 13 is connected. A resistance 17 isconnected, in parallel with the series connection of the winding 5,condenser 12 and resistance 13, from contact 9 to the side of the'sourceof potential 14 to .which resistances 13 and 16 are connected. Aresistance 18 is connected, inparallel with the series connection of thewinding 6, conv denser 15 and resistance 16, from contact l() to theside of the source of potential 14 to which `resistances 13, 16 and 17are connected. The opposite side of the potential source 14 is connectedto the armature 7.

The operation of this system is as follows: `When an impulse, as forexample, from the output of a. voice-operated detector cir- 1 and 2 arecircuit diagrams of di-,

NEWJERSEY, ASSIGNOR TO BELL TELEPHONE OF NEW YORK, N. Y., A CORPORATIONNEW (I il cuit (not shown) is transmitted from the input circuit llthrough winding the armature 7 is moved from its normal position shown,thereby breaking the connection between armature 7 and contact 9. Thenthe connection between armature 7 and contact E) is broken condenser l2discharges through resistances l?) and 17 and winding 5, thereby aidingthe current through Winding il in moving the armature toward the yokeleg L9.

Vfhen the arinaftlnfe 7 makes connection with contact l0 the condenserl5 is charge/l up through the circuit from the source o'l' potential le,resistance 1G, condenser l5, Winding G, contact Yl0 and arma-ture 7 tothe other side oi the source oit potential M, thercby tending to holdthe armature 7 rigidly in its operated position Without contactchatte-.'ng taking); place between the armature 7 and contact l0.

Then the operating current through Winding` irl approaches zeroamplitude and the condenser l2 has discharged and the condenser l5 hascharged, the biasing means 8, causes the armature 7 to move away 'fromthe yoke leg` l), thereby movin armature 7 away Y troni contact 10. Assoon as armature 7 disconnects .from contact 10, the condenser .l5discl'iargcs through resistances 1G and '1S and winding (3, therebyaiding the biasing means in moving the armature 7 to its nonoperated rnormal position.

soon as armature 7 makes connection with Contact 9, condenser l).- ischarged up through the circuit from the source o'l" potential let,resistance 13, condenser lf2, Winding 5, contact 9, and armature 7 tothe other side oi the source ot potential lil, thereby tending to holdthe armature 7 rigidly in its nor mal position without contactchattering taking place between armature 7 and Contact 9.

A'tter condenser l5 has discharged and condenser 12 has charged, thesystem is ready to again operate in responso to an impulse transmittedthrough Winding 3.

Referring to Figs. 2 and QMA, the polar relay 5l comprises a yoke apermanent magnet 5st associated With the yoke, Wind ings 53, and 56 andan arn'iature 57, vwhich arnniture `is arranged to swing betweencontacts 59 and GO. 'lhe armature 57 is held in the position shown, awayfrom the yoke leg (39, by biasing` means finding is connected. to theinput circuit (il. @ne cnd of Winding is connected to the contact 59.The other end ot winding 55 is connected. to one end of condenser 62 andthe other end of which condenser is connected through. a resistance G3to one side oi" a source oi potential (St. One end o'l1V winding 5G isconnected to contact G0. The other end of winding 5G is connected to oneend oit condenser G5, the other end ot which condenser is connectedthrough a resistance (En to the side of' the source of potential (ist towhich resistance 63 is connected. A resistance 67 is connected, inparallel with the series connection of the winding 55, condenser 62,resistance 63 and source of potential 64, from contact 59 to the side ofthe source of potential (54 opposite that to which the resistances G3and (i6 are connected. A resistance 68 is connected, in parallel withthe series connection of the Wiiiding 5G, condenser 65, resistance G6and source ot potential (34, from contact 6() to the junction of theresistance 67 and the source ol': potential (S4. The armature 57 isconnected to the unction of resistances G3 and 66 and the source ofpotential 611;.

The operation of this system is as follows: When an impulse, as forexample, from the output of a voice-operated detector circuit (notshown) is transmitted from the input circuit 61 through Winding 53, thearmature 57 is moved from its normal position shown toward yoke leg 69,thereby breaking the connection between armature 57 and contact 59. Whenthe connection between ari'iiature 57 and contact 59 is broken,condenser (52 charges through resistances (33 and (S7 and winding 5Vthereby aiding the operating current through Winding 53l in moving thearmature 57 toward yoke leg G9.

lVhen armature 57 makes connection With contact GO the condenser G5discharges through the circuit from condenser (35, resistance GG,armature 57, contact (i0, andn'imb ing 56 to the opposite side ofcondenser (l5, thereby tending to hold the armature 57 rigidly in itsIoperated position without contact chattering taking place betweenarmature 57 and contact G0.

Then the operating current througl'i winding 53 approaches Zeroamplitude and the. condenser 62 has charged and the condenser hasdischarged, the biasing means 58 causes the armature 57 to more awaytroni the yoke leg 69, thereby disconnecting armature 57 from contact60. As soon as armature 57 disconnects from contact G0 the condenser (55charges up through resistances (36 and (SFS and Winding 5G, therebyaiding the biasing means in returning the armature 57 to its normalposition.

As soon as the arii'iature 57 makes connection with the contact 59, thecondenser 32 discharges through the circuit including the resistance G3,armature 57, contact :Wand Winding 55, thereby tending to hold thearmature 57 rigidly in its normal position without chattering takingplace between a ature 57 and contact 59.

After condenser G5 has charged and rondenser 62 has discharged, thesystem is again ready to operate in response to an impulse transmittedthrough Winding 58.

It is within the invention to omit the bia ing means referred to in thedetailed do scription of the construction and operation having a pair ofcontacts, an armature arranged to swing between said contacts, an

operating winding and accelerating wind-` ings, a source of potential, acapacitance and a resistance connected in series across each of saidaccelerating windings, connections from said resistances to saidcontacts, other connections from said resistances to said source ofpotential, a connection 'from said armature to said source of potential,said connection arranged in a manner such that th charging and thedischarging of said condensers accelerates the movement of said relayarmature from either of said contacts to the other of said contacts andhold said armature against said other contact for a predetermined periodof time.

Q. A polar relay comprising an armature, a pair of contacts betweenwhich said armature is arranged to swing, an operating winding, anelectric accelerating circuit associated with said armature and thenormally closed contact, another electrical accelerating circuitassociated with said armature and the normally open contact, saidelectrical accelerating circuits comprising accelerating relay windings,capacitances, resistances said contacts, said armature and a source ofpotential.

3. A polar relay comprising an armature, a pair of contacts betweenwhich said armature is arranged to swing, an operating winding, anelectric accelerating circuit associated .with said armature and thenormally closed contact, another electrical accelerating circuitassociated with said armature and the normally open contact, saidiirst-mentioned electrical accelerating circuit comprising anaccelerating relay winding one end of which is electrically connected tosaid normally closed contact and the other ond of which is electricallyconnected through a condenser and a resistance to a source of potential,another resistance electrically connected from said normally closedContact to one terminal of said source of potential and a connectionfrom said. source of potential to said armature, said secondv contact toone terminal of said source of potential.

4. A polar relay circuit, including a relay having a pair of contacts,an armature arranged to swing between said contacts, an operatingwinding, accelerating windings with associated capacitances, resistancesand a source of potential, connections from said contacts and saidarmature to said accelerating windings and their associatedcapacitances, resistances, and source of potential, so arranged that theopening of either contact initiates a change in the charge of one ofsaid. capacitances through the accelerating winding associatedtherewith, thereby accelerating and positively carrying said armature tothe other of said contacts, and the closing of either contact initiatesa change in the charge of one of said capacitances through theaccelerating winding associated therewith, thereby holding saidarmaturemore firmly to said closed contact.

5. A polar relay circuit, including a relay having a pair of contacts,an armature arranged to swing between said contacts, an operatingwinding, accelerating windings with associated capacitances, resistancesand a source of potential, connections from said contacts and saidarmature to said accelerating windings and their associated capaci'-tances, resistances, and source of potential, so arranged that theopening of either contact initiates a change in the charge of one ofsaid capacitances through the accelerating winding associated therewith,thereby accelerating and positively carrying said armature to the otherlof said contacts, and the closing of either contact initiates a changein the charge of one of said capacitances through the acceleratingwinding associated therewith, thereby holding said armature more firmlyto said closed contact for a predetermined period of time.

6. In a relay circuit, a relay having separate windings, each in circuitwith a condenser, a moving armature controlled by said windings, andmeans under control of said armature for alternatively and individuallycharging said condensers and discharging them through the respectivewindings, each winding on the charge of its associated condenserinfluencing said armature in one direction and upon the discharge of itsassociated condenser influencing the armature in the opposite direction.

In witness whereof, I hereunto subscribe my name this 3 day of June,1929.

ROBERT C. MATHES.

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